Convert FB2 to MOBI.
Turn a FictionBook (FB2) ebook into MOBI to read it on an older Kindle loaded over USB.
FB2 on a Kindle
Kindles do not read FictionBook. Converting to MOBI makes the book readable on any Kindle, including the oldest models.
What carries across
Sections become chapters with a table of contents, and the title, author and cover come with them.
Size change
The MOBI is usually smaller than an uncompressed FB2.
How it works
- 01
Upload your FB2
Drop a file or pick one from your device. Private by default.
- 02
Convert with Calibre
Calibre maps the FictionBook structure into a Kindle MOBI file.
- 03
Download
Grab your MOBI.
Readable on older Kindles
Chapters, titles and images kept
Private uploads, auto-deleted after 1 hour
No watermark, no signup to try
Open-source Calibre engine
FB2 to MOBI
This re-flows the book into MOBI, carrying chapters, the table of contents and images. Reflowable ebook formats adapt to the reader's screen and font size. Heavy fixed layouts (comics, textbooks) convert less cleanly.
Common questions
Is it free?+
Yes. Convert FB2 to MOBI free. No signup and no watermark. Free covers 10 server conversions a day, up to 100 MB a file. Pro removes the daily limit and raises the file limit to 2 GB.
Is my file private?+
Your file is uploaded to a private bucket, converted on our own engine, and auto-deleted after 1 hour. It is never sent to a third-party converter.
Should I use MOBI or EPUB?+
For Send to Kindle, use FB2 to EPUB, because Amazon stopped accepting MOBI there in 2022. MOBI is for older Kindles you load over USB.
Are Cyrillic books supported?+
Yes. FB2 is Unicode and the text carries into the MOBI as text.
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